ARM: KVM: Yield CPU when vcpu executes a WFE

On an (even slightly) oversubscribed system, spinlocks are quickly
becoming a bottleneck, as some vcpus are spinning, waiting for a
lock to be released, while the vcpu holding the lock may not be
running at all.

This creates contention, and the observed slowdown is 40x for
hackbench. No, this isn't a typo.

The solution is to trap blocking WFEs and tell KVM that we're
now spinning. This ensures that other vpus will get a scheduling
boost, allowing the lock to be released more quickly. Also, using
CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT slightly improves the performance
when the VM is severely overcommited.

Quick test to estimate the performance: hackbench 1 process 1000

2xA15 host (baseline):	1.843s

2xA15 guest w/o patch:	2.083s
4xA15 guest w/o patch:	80.212s
8xA15 guest w/o patch:	Could not be bothered to find out

2xA15 guest w/ patch:	2.102s
4xA15 guest w/ patch:	3.205s
8xA15 guest w/ patch:	6.887s

So we go from a 40x degradation to 1.5x in the 2x overcommit case,
which is vaguely more acceptable.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
index d556f03..fe395b7 100644 (file)
--- a/arch/arm/include/asm/kvm_arm.h
+++ b/arch/arm/include/asm/kvm_arm.h
@@ -67,7 +67,7 @@
  */
 #define HCR_GUEST_MASK (HCR_TSC | HCR_TSW | HCR_TWI | HCR_VM | HCR_BSU_IS | \
                        HCR_FB | HCR_TAC | HCR_AMO | HCR_IMO | HCR_FMO | \
-                       HCR_SWIO | HCR_TIDCP)
+                       HCR_TWE | HCR_SWIO | HCR_TIDCP)
 #define HCR_VIRT_EXCP_MASK (HCR_VA | HCR_VI | HCR_VF)
 
 /* System Control Register (SCTLR) bits */
@@ -208,6 +208,8 @@
 #define HSR_EC_DABT    (0x24)
 #define HSR_EC_DABT_HYP        (0x25)
 
+#define HSR_WFI_IS_WFE         (1U << 0)
+
 #define HSR_HVC_IMM_MASK       ((1UL << 16) - 1)
 
 #define HSR_DABT_S1PTW         (1U << 7)

diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
index ebf5015..466bd29 100644 (file)
--- a/arch/arm/kvm/Kconfig
+++ b/arch/arm/kvm/Kconfig
@@ -20,6 +20,7 @@ config KVM
        bool "Kernel-based Virtual Machine (KVM) support"
        select PREEMPT_NOTIFIERS
        select ANON_INODES
+       select HAVE_KVM_CPU_RELAX_INTERCEPT
        select KVM_MMIO
        select KVM_ARM_HOST
        depends on ARM_VIRT_EXT && ARM_LPAE

diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
index df4c82d..c4c496f 100644 (file)
--- a/arch/arm/kvm/handle_exit.c
+++ b/arch/arm/kvm/handle_exit.c
@@ -84,7 +84,11 @@ static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
 static int kvm_handle_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run)
 {
        trace_kvm_wfi(*vcpu_pc(vcpu));
-       kvm_vcpu_block(vcpu);
+       if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE)
+               kvm_vcpu_on_spin(vcpu);
+       else
+               kvm_vcpu_block(vcpu);
+
        return 1;
 }